铣削颤振是发生在加工过程中的一种自激振动现象,该现象加剧刀具磨损,降低工件表面加工精度,减小加工中心的使用寿命,严重制约加工中心的使用效率。针对铣削颤振的研究,提出了一种改进的半离散法,来预测具有多个时滞的铣削稳定性。以不等齿距铣刀铣削为例,与已有的零阶解析方法进行比较,理论验证了所提出的方法对于变齿距铣刀在主轴转速8 000到9 000r/min区间内,将获得较大的稳定性预测极限,而在其他转速区间内,两种预测结果具有良好的吻合性。 Milling flutter is a phenomenon of self-excited vibration that occurs in the machining process. This phenomenon aggravates the tool wear, reduces the surface machining precision, reduces the service life of the machining center, and seriously restricts the use efficiency of the machining center. Aiming at the research of milling flutter, an improved semi-discrete method is proposed to predict the milling stability with multiple time delays. Taking unequal tooth milling cutter milling as an example, compared with the existing zero-order analytical methods, the theory verifies that the proposed method will be able to achieve a long-distance milling cutter with a spindle speed of 8 000 to 9 000 r / min Larger stability prediction limit, and in other speed range, the two prediction results have good agreement.